Unsetting proxy before executing CURL

Current CURL doesn't respect no_proxy from the environment vars
so we need to unset proxy var before execution.

Change-Id: I2d6778fb379c96bfad050d694b31c1e93b1105ef
diff --git a/gerrit/client/service.sls b/gerrit/client/service.sls
index 0ad991b..bd1edee 100644
--- a/gerrit/client/service.sls
+++ b/gerrit/client/service.sls
@@ -40,7 +40,7 @@
 #}
 gerrit_try_login:
   cmd.run:
-    - name: curl -svr -X POST --data "username={{ client.server.user }}&password={{ client.server.password }}" {{ client.server.protocol|default('http') }}://{{ client.server.host }}:{{ client.server.http_port|default(80) }}/login
+    - name: http_proxy='' curl -svr -X POST --data "username={{ client.server.user }}&password={{ client.server.password }}" {{ client.server.protocol|default('http') }}://{{ client.server.host }}:{{ client.server.http_port|default(80) }}/login
 {%- endif %}
 
 /etc/github/github-projects.secure.config: